=  NOW 25 WPM  =  TEXT IS FROM SEPTEMBER 2021  QST  PAGE 94 =

TWO VFOS COULD NOT REACH ANY PART OF THE BAND.  THE TWO VFOS COULD ALSO BE
USED TO RECEIVE TWO DIFFERENT SPOTS IN THE SAME BAND.  IN THE DUAL RECEIVE
MODE, THE RATIO OF RF GAIN BETWEEN THE TWO RECEIVE SIGNALS COULD BE
ADJUSTED, SO ONE SIGNAL WOULD NOT OVER RIDE THE OTHER.  IFS AND FILTERS THE
SIGNAL ONE CX 7 UPCONVERTED THE COVERED BANDS TO 39 TO 40 MHZ, AN EARLY
EXAMPLE OF AMATEUR RADIO UPCONVERSION.  THE FINAL INTERMEDIATE FREQUENCY
WAS 8R8 MHZ, WHICH WAS UNIQUE TO THE CX 7 AND ITS LATER VERSIONS.  THE
RADIO WAS SUPPLIED WITH A CRYSTAL LATTICE FILTER AT 8R8 MHZ OPTIMIZED FOR
SINGLE SIDEBAND SSB SIGNALS.  ALSO AVAILABLE WERE TWO FILTERS FOR CW USE, A
LOWER COST 400 HZ WIDE FILTER, AND A PREMIUM 300 HZ FILTER WITH A BETTER
SHAPE FACTOR FOR REJECTING STRONG OFF FREQUENCY SIGNALS.  FOR RADIOTELETYPE
RTTY USE, A 1,200 HZ WIDE FILTER WAS OFFERED.  THE SIGNAL ONE COULD
ACCOMMODATE TWO ADDITIONAL FILTERS IN ADDITION TO THE SSB FILTER.  THE
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